• Yaowu Xu's avatar
    added separate entropy context for alt_ref · acf5d20c
    Yaowu Xu authored
    This commit added code to keep track of separate entropy contexts for
    normal frames and alt ref frames. The underly assumption was that the
    two type of frames have different entropy characteristics given they
    typically have quite different quantization levels. By keeping entropy
    contexts separate, it helps the entropy context distribution to be more
    closely adapted to each frame type.
    
    Tests on derf set showed a good and very consistent gain on all clips
    on all metrics, avg psnr: 0.89%, overall psnr: 0.84% and ssim 0.93%.
    
    http://www.corp.google.com/~yaowu/no_crawl/mulcontext.html
    
    Change-Id: I15bc9697f6ff7829042911fe0c62930585d7e65d
    acf5d20c
decodemv.c 25.8 KB